|
| 1 | +import { TestScheduler } from 'rxjs/testing' |
| 2 | +import { emitLoading, LOADING, MaybeLoadingResult } from './loading' |
| 3 | + |
| 4 | +const deepStrictEqual = chai.assert.deepStrictEqual.bind(chai.assert) |
| 5 | + |
| 6 | +const inputAlphabet: Record<'l' | 'e' | 'i' | 'r', MaybeLoadingResult<number | null>> = { |
| 7 | + // loading |
| 8 | + l: { isLoading: true, result: null }, |
| 9 | + // empty |
| 10 | + e: { isLoading: false, result: null }, |
| 11 | + // intermediate result |
| 12 | + i: { isLoading: true, result: 1 }, |
| 13 | + // result |
| 14 | + r: { isLoading: false, result: 2 }, |
| 15 | +} |
| 16 | + |
| 17 | +const outputAlphabet = { |
| 18 | + // undefined |
| 19 | + u: undefined, |
| 20 | + // empty |
| 21 | + e: null, |
| 22 | + // loading |
| 23 | + l: LOADING, |
| 24 | + // intermediate result |
| 25 | + i: inputAlphabet.i.result, |
| 26 | + // result |
| 27 | + r: inputAlphabet.r.result, |
| 28 | +} |
| 29 | + |
| 30 | +describe('emitLoading()', () => { |
| 31 | + it('emits an empty result if the source emits an empty result before the loader delay', () => { |
| 32 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 33 | + scheduler.run(({ cold, expectObservable }) => { |
| 34 | + const source = cold('l 10ms e', inputAlphabet) |
| 35 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('u 10ms e', outputAlphabet) |
| 36 | + }) |
| 37 | + }) |
| 38 | + it('emits a loader if the source has not emitted after the loader delay', () => { |
| 39 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 40 | + scheduler.run(({ cold, expectObservable }) => { |
| 41 | + const source = cold('400ms r', inputAlphabet) |
| 42 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('u 299ms l 99ms r', outputAlphabet) |
| 43 | + }) |
| 44 | + }) |
| 45 | + it('emits an empty result if the source completes without a result', () => { |
| 46 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 47 | + scheduler.run(({ cold, expectObservable }) => { |
| 48 | + const source = cold('400ms |', inputAlphabet) |
| 49 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('u 299ms l 99ms (e|)', outputAlphabet) |
| 50 | + }) |
| 51 | + }) |
| 52 | + it('emits an empty result if the source completes without a result before the loader delay', () => { |
| 53 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 54 | + scheduler.run(({ cold, expectObservable }) => { |
| 55 | + const source = cold('10ms |', inputAlphabet) |
| 56 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('u 9ms (e|)', outputAlphabet) |
| 57 | + }) |
| 58 | + }) |
| 59 | + it('emits an empty result if the source completes after an empty loading result', () => { |
| 60 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 61 | + scheduler.run(({ cold, expectObservable }) => { |
| 62 | + const source = cold('l 400ms |', inputAlphabet) |
| 63 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('u 299ms l 100ms (e|)', outputAlphabet) |
| 64 | + }) |
| 65 | + }) |
| 66 | + it('emits the last result if the source completes after an intermediate non-empty loading result', () => { |
| 67 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 68 | + scheduler.run(({ cold, expectObservable }) => { |
| 69 | + const source = cold('-i-|', inputAlphabet) |
| 70 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('ui-(i|)', outputAlphabet) |
| 71 | + }) |
| 72 | + }) |
| 73 | + it('errors if the source errors', () => { |
| 74 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 75 | + scheduler.run(({ cold, expectObservable }) => { |
| 76 | + const error = new Error('test') |
| 77 | + const source = cold('10ms #', inputAlphabet, error) |
| 78 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('u 9ms #', outputAlphabet, error) |
| 79 | + }) |
| 80 | + }) |
| 81 | + it('emits a loader if the source has not emitted a result after the loader delay', () => { |
| 82 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 83 | + scheduler.run(({ cold, expectObservable }) => { |
| 84 | + const source = cold('l 400ms r', inputAlphabet) |
| 85 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('u 299ms l 100ms r', outputAlphabet) |
| 86 | + }) |
| 87 | + }) |
| 88 | + it('emits a loader if the source first emits an empty result, but then starts loading again', () => { |
| 89 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 90 | + scheduler.run(({ cold, expectObservable }) => { |
| 91 | + const source = cold('e 10ms l 400ms r', inputAlphabet) |
| 92 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('(ue) 296ms l 111ms r', outputAlphabet) |
| 93 | + }) |
| 94 | + }) |
| 95 | + it('emits a loader if the source first emits an empty result, but then starts loading again after the loader delay already passed', () => { |
| 96 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 97 | + scheduler.run(({ cold, expectObservable }) => { |
| 98 | + const source = cold('e 400ms l 400ms r', inputAlphabet) |
| 99 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('(ue) 397ms l 400ms r', outputAlphabet) |
| 100 | + }) |
| 101 | + }) |
| 102 | + it('hides the loader when the source emits an empty result', () => { |
| 103 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 104 | + scheduler.run(({ cold, expectObservable }) => { |
| 105 | + const source = cold('l 400ms e', inputAlphabet) |
| 106 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('u 299ms l 100ms e', outputAlphabet) |
| 107 | + }) |
| 108 | + }) |
| 109 | + it('emits intermediate results before the loader delay', () => { |
| 110 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 111 | + scheduler.run(({ cold, expectObservable }) => { |
| 112 | + const source = cold('l 10ms i 10ms r', inputAlphabet) |
| 113 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('u 10ms i 10ms r', outputAlphabet) |
| 114 | + }) |
| 115 | + }) |
| 116 | + it('emits intermediate results after the loader delay and showing a loader', () => { |
| 117 | + const scheduler = new TestScheduler(deepStrictEqual) |
| 118 | + scheduler.run(({ cold, expectObservable }) => { |
| 119 | + const source = cold('l 400ms i 10ms r', inputAlphabet) |
| 120 | + expectObservable(source.pipe(emitLoading(300, null))).toBe('u 299ms l 100ms i 10ms r', outputAlphabet) |
| 121 | + }) |
| 122 | + }) |
| 123 | +}) |
0 commit comments